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2806:Selecting Problems

题目描述
The college of computer & software is going to hold an ACM contest. N (0<N<=1000) students have registered for the contest, and the teacher LCY has thought up M (0<M<=15) problems numbered from 1 to M. LCY is so familiar with the students that he can forecast the result of every student for the M problems.
Now he will select as many problems as possible from the M problems. And he want at least K (0<=K<=M) students to solve all problems. Will you compute the maximum number of problems he can choose? Output "0" if there is no selection can satisfy the condition.
输入解释
First line of each case contains three integers: N, M and K. Then N lines follow, and each line has the format:
Name P N1 N2 … NP.
Name (the length won't exceed 20), P (number of problems he/she can solve, 0<=P<=M), then P integers (represent the problems, 1-based).
输出解释
Output the maximum number of problems.
输入样例
2 6 2
zl1 6 1 2 3 4 5 6
zl2 5 1 2 3 4 5
2 3 2
zl1 2 2 3
zl2 1 1
输出样例
5
0
来自杭电HDUOJ的附加信息
Recommend lcy

该题目是Virtual Judge题目,来自 杭电HDUOJ

源链接: HDU-2806

最后修改于 2020-10-25T22:57:01+00:00 由爬虫自动更新

共提交 0

通过率 --%
时间上限 内存上限
2000/1000MS(Java/Others) 32768/32768K(Java/Others)